Clamshell sandwich container



FIG. 1 is a perspective view of a clamshell sandwich container showing our new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a left side elevation thereof, the right side elevation being a mirror image thereof;

FIG. 4 is a front elevation thereof;

FIG. 5 is a rear elevation thereof; and

FIG. 6 is a bottom plan view thereof. 

The ornamental design for clamshell sandwich container, as shown and described. 